Yantra, meaning 'device' or instrument is usually a geometric representation designed to identify the mind of a worshipper with his chosen deity. This yantra is constructed with a circular point or 'bindu' at the centre embodying the seed or 'bija' of the deity. Encompassing the bindu are triangles, the upward pointing represent the god and the downward pointing triangles represent the goddess. Outside this in concentric circles are the lotus petals, eight in the inner and sixteen in the outer circle. The whole diagram is contained within a square 'bhupura' or ground plan with four gateways in the cardinal directions.
It is prescribed that a yantra or a mandala be painted in white, red, yellow, blue and black. A Madhubani 'artist's' love of colour is well known, but here the artist couple has tried to maintain the order to some extent.
This description by Renu Rana.